BonsaiMon

Abe, Training pots are larger than the pot the tree will eventually be growing in. Not always deeper but bigger. It can be a wooden box , a plastic tub, a large cut down nursery container, etc., or even a bonsai pot. When a tree is in the beginning stages of training, more roots will help with quicker and more vigorous growth. Depending on the species, the tree will be moved from the training pot to one more in proportion to the tree, when the basic structure is achieved.. this includes rootage, trunk size, branching, and any other attribute which may need long term growing to achieve. Hope this helps answer your questions.

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peace,
tom stoute

http://bonsaiinsights.spaces.live.com/